Nuclide reference
La-140 — Lanthanum-140
La-140 की half-life 1.6785 d है। मुख्य decay mode: β⁻ decay → Ce-140 (100%)।
Identification
- तत्व
- Lanthanum (La)
- Atomic number Z
- 57
- Mass number A
- 140
- State
- Radioactive
Key quantities
- Half-life
- 1.6785 d
- विशिष्ट गतिविधि
- 2.056e+16 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 0.4 TBq / 0.4 TBq
- D-value (НП-067-24)
- 0.03 TBq
Decay modes
- β⁻ decay → Ce-140 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,596.21 | 95.4 |
| 487.021 | 45.51 |
| 815.772 | 23.28 |
| 328.762 | 20.32 |
| 925.189 | 6.897 |
| 867.846 | 5.505 |
| 751.637 | 4.331 |
| 2,521.4 | 3.463 |
| 432.493 | 2.9 |
| 919.55 | 2.662 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,350.2 | 43.9 |
| 1,678.9 | 20.2 | |
| 1,240.8 | 11.05 | |
| 2,166 | 5.9 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
Reference data vs computed valuesHalf-life, gamma lines and D-value are reference data (ENDF/B-VIII.0, НП-067-24).Gamma constant Γ 1 m पर H*(10) है, ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) से गणना की गई, equilibrium में short-lived progeny सहित (जैसे Cs-137/Ba-137m, Ra-226 series); specific activity molar mass M ≈ mass number A का उपयोग करती है।